Abstract
Multi-band microwave fllters are important for multifunc- tional and miniaturization requirement of portable communication equipment. In this paper, tri-section split ring stepped-impedance res- onator is analyzed, and new compact dual-band and tri-band bandpass fllters are proposed by using split ring stepped-impedance resonators, and the designs are demonstrated by measurement. The new dual- band fllters operate at about 2.4 and 5.5GHz which meet IEEE 802.11 application requirements, and the new tri-band fllters operate at about 2.4{2.6, 3.3{3.6 and 5.2{5.6GHz, and fllter sizes are greatly reduced compared with relative reports. The designed fllters have advantages of compact and miniature structures, low passband insertion losses and good frequency selectivity, all these have prospect to be applied in wireless communication systems.
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